Turtles won't stop attempting to surface/recognize that they can't support...
Assuming there is a script that triggers that causes them to surface until they beach however if they can't surface due to the hole they are using is a 2×2 and there is a lilypad preventing then form completing the surface script they won't stop trying to surface.
To recreate just make an aquarium any size should do with a 2×2 hole on the top with water, place a lilypad on 1 of the source blocks
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Cleaning up old tickets: This ticket has not been updated recently (~1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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Miht have selected wrong version... Should be 1.5 lol